Question

1. The diagram below shows 2 test tubes A & B. A test tubes
contains a green water plant. B test tube contains both a
green plant & a snail. Both are kept in sunlight.
Answer the following:
a) Name the physiological process.

b) What is the purpose of keeping a snail
in test-tube B?

c) Why does test tube 'B' have more 02-green bubbles of oxygen?

d) Give an example of water plant that can be used in the above experiment.

e) Write overall chemical equation for the above process.
​

Answer 1

Answer:

(i) In the given experiment, bubbles of oxygen are released due to the process of light reaction of photosynthesis. 

(ii) Photosynthesis is a process in which green plants (plant cells having chlorophyll) take in carbon-dioxide and water in presence of sunlight to produce glucose. It releases oxygen gas during the photolysis of water which is a part of the light reaction.

(iii) The purpose of keeping the snail in the test tube B is the production of carbon dioxide which is used by the plant.

(iv) Test tube B have more bubbles of oxygen because the rate of photosynthesis is more in test tube B as it gets more CO2 from the snail.

(v) Hydrilla is a water plant which is used for such experiments.

(vi) 6CO2+12H2OlightchlorophyllC6H12O6+6H2O+6O2↑

This might help you✌️✌️

Answer 2

${\huge{\tt{\underline{\underline{Answer :}}}}}$

$\tt{(1) The \: Physiological \: Process \: being \: studied \: }$

$\tt{is \: “photosynthesis”.}$

$\tt{(2) The \: purpose \: of \: keeping \: a \: snail \: in \: test-tube \: 'B' }$

$\tt{is \: to \: increase \: the \: rate \: of }$

$\tt{photosynthesis \: by \: increasing \: the \: }$

$\tt{concentration \: of \: carbon \: dioxide.} \:$

$\tt{(3) The \: plant \: in \: test \: tube \: B \: has \: more }$

$\tt{concentration \: of \: CO2 \: available \: because \: the}$

$\tt{snail \: releases \: CO2 \: during \: respiration.}$

$\tt{This \: increases \: the \: rate \: of \: photosynthesis }$

$\tt{in \: the \: plant \: placed \: in \: test \: tube \: B \: }$

$\tt{which \: leads \: to \: the \: release \: of \: more \: }$

$\tt{ \: \: amount \: of \: oxygen.}$

$\tt{(4) Hydrilla \: is \: a \: water \: plant \: which \: }$

$\tt{ \: \: is \: used for \: such \: experiments.}$

$\tt{ (5) 6CO2+12H2O \: \frac{light}{chlorophyll}</p><p> \: C6H12O6+6H2O+6O2↑}</p><p></p><p>$